A test of Radial Acceleration Relation for the Giles et al Chandra cluster sample

Pradyumna, S.; Desai, S.

doi:10.1016/j.dark.2021.100854

Cited by 13 publications

(6 citation statements)

References 39 publications

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“…The standard deviation of the fitted Gaussian function gives the residual scatter in dex, which is used to characterize the tightness of RAR relation of this sample. As we can see, the residual scatter obtained (0.32 dex) is about three times higher than what was obtained with the cluster samples [26,36,37] or for galaxies [55]. Therefore, we conclude that our sample of galaxy groups does not show the same tight scatter seen previously for other astrophysical systems.…”

Section: Radial Acceleration Relation In Groupscontrasting

confidence: 43%

“…As a follow-up to another recent work of ours which tested the RAR for three different cluster samples [36,37], we also implemented a test of RAR using the same group sample to see how well RAR holds up at group scales. Our results are summarized in Table 2.…”

Section: Discussionmentioning

confidence: 99%

“…Although, it is known for more than three decades that the MOND phenomenology cannot obviate the need for dark matter in galaxy clusters [34,35], a test of RAR would be an acid test for the models which reproduce MOND behavior at galactic scales but need dark matter at cluster scales. Motivated by these considerations, multiple groups [26,27,36,37] carried out a test of the RAR using different samples of galaxy clusters. These analyses found a tight scatter of between 0.11 to 0.13 dex and an elevated acceleration scale a 0 ∼ 10 −9 m/s 2 .…”

Section: Introductionmentioning

confidence: 99%

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A test of constancy of dark matter halo surface density and radial acceleration relation in relaxed galaxy groups

Gopika

Desai

2021

Physics of the Dark Universe

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Section: Radial Acceleration Relation In Groupscontrasting

confidence: 43%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A test of constancy of dark matter halo surface density and radial acceleration relation in relaxed galaxy groups

Gopika

Desai

2021

Physics of the Dark Universe

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“…Freundlich et al 2022), local dwarf spheroidals (e.g. McGaugh & Wolf 2010McGaugh & Milgrom 2013), low-acceleration regions including the outer Milky Way (Oman et al 2020), stacked weak lensing (Brouwer et al 2021) and groups and clusters of galaxies (Chae et al 2019(Chae et al , 2020aChan & Del Popolo 2020;Tian et al 2020;Pradyumna & Desai 2021;Gopika & Desai 2021). Some of this data appears to deviate from the MOND expectation.…”

Section: Discussionmentioning

confidence: 95%

The underlying radial acceleration relation

Desmond¹

2023

Preprint

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The radial acceleration relation (RAR) of late-type galaxies relates their dynamical acceleration, g obs , to that sourced by baryons alone, g bar , across their rotation curves. Literature fits to the RAR have fixed the galaxy parameters on which the relation depends-distance, inclination, luminosity and mass-to-light ratios-to their maximum a priori values with an uncorrelated Gaussian contribution to the uncertainties on g bar and g obs . In reality these are free parameters of the fit, contributing systematic rather than statistical error. Assuming a range of possible functional forms for the relation with or without intrinsic scatter (motivated by Modified Newtonian Dynamics with or without the external field effect), I use Hamiltonian Monte Carlo to perform the full joint inference of RAR and galaxy parameters for the SPARC dataset. This reveals the intrinsic RAR underlying that observed. I find an acceleration scale a 0 = (1.19 ± 0.04 (stat) ± 0.09 (sys)) × 10 −10 m s −2 , an intrinsic scatter σ int = (0.034 ± 0.01 (stat) ± 0.01 (sys)) dex (assuming the SPARC error model is reliable) and weak evidence for the external field effect. I make summary statistics of all my analyses publicly available for future SPARC studies or applications of a calibrated RAR, for example redshift-independent distance measurement.

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“…Also, if the fundamental acceleration scale originates from modified gravity, it must be universal and valid for elliptical galaxies and galaxy clusters as well. In particular, some recent studies show that the RAR in elliptical galaxies is consistent with the sRAR [25,36] while some other studies show that the RAR in galaxy clusters have large scatters and does not agree with the sRAR [37,38,39,40]. Some studies also reveal that the sRAR is not obeyed for dwarf disk spirals and low-surface-brightness galaxies [41].…”

Section: Introductionmentioning

confidence: 95%

There is no universal acceleration scale in galaxies

Chan¹,

Desai²,

Popolo³

2022

Preprint

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Recently, many studies seem to reveal the existence of some correlations between dark matter and baryonic matter. In particular, the unexpected tight Radial Acceleration Relation (RAR) discovered in rotating galaxies has caught much attention. The RAR suggests the existence of a universal and fundamental acceleration scale in galaxies, which seems to challenge the ΛCDM model and favour some modified gravity theories. A large debate about whether RAR is compatible with the ΛCDM model has arisen. Here, by analysing the high quality velocity dispersion profiles of 13 E0-type elliptical galaxies in the SDSS-IV MaNGA sample and assuming a power-law function of radius r for the 3-dimensional velocity dispersion in each galaxy, we report the RAR for E0-type elliptical galaxies and we show that the resultant RAR has more than 5σ deviations from the RAR in late-type galaxies. This new RAR provides an independent probe to falsify the existence of any universal acceleration scale in galaxies. Our result significantly challenges those modified gravity theories which suggest the existence of any universal acceleration scale.

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A test of Radial Acceleration Relation for the Giles et al Chandra cluster sample

Cited by 13 publications

References 39 publications

A test of constancy of dark matter halo surface density and radial acceleration relation in relaxed galaxy groups

A test of constancy of dark matter halo surface density and radial acceleration relation in relaxed galaxy groups

The underlying radial acceleration relation

There is no universal acceleration scale in galaxies

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